target-sparc/cc_helper.c

   1 /*
   2  * Helpers for lazy condition code handling
   3  *
   4  *  Copyright (c) 2003-2005 Fabrice Bellard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "cpu.h"
  22 #include "exec/helper-proto.h"
  23
  24 static uint32_t compute_all_flags(CPUSPARCState *env)
  25 {
  26     return env->psr & PSR_ICC;
  27 }
  28
  29 static uint32_t compute_C_flags(CPUSPARCState *env)
  30 {
  31     return env->psr & PSR_CARRY;
  32 }
  33
  34 static inline uint32_t get_NZ_icc(int32_t dst)
  35 {
  36     uint32_t ret = 0;
  37
  38     if (dst == 0) {
  39         ret = PSR_ZERO;
  40     } else if (dst < 0) {
  41         ret = PSR_NEG;
  42     }
  43     return ret;
  44 }
  45
  46 #ifdef TARGET_SPARC64
  47 static uint32_t compute_all_flags_xcc(CPUSPARCState *env)
  48 {
  49     return env->xcc & PSR_ICC;
  50 }
  51
  52 static uint32_t compute_C_flags_xcc(CPUSPARCState *env)
  53 {
  54     return env->xcc & PSR_CARRY;
  55 }
  56
  57 static inline uint32_t get_NZ_xcc(target_long dst)
  58 {
  59     uint32_t ret = 0;
  60
  61     if (!dst) {
  62         ret = PSR_ZERO;
  63     } else if (dst < 0) {
  64         ret = PSR_NEG;
  65     }
  66     return ret;
  67 }
  68 #endif
  69
  70 static inline uint32_t get_V_div_icc(target_ulong src2)
  71 {
  72     uint32_t ret = 0;
  73
  74     if (src2 != 0) {
  75         ret = PSR_OVF;
  76     }
  77     return ret;
  78 }
  79
  80 static uint32_t compute_all_div(CPUSPARCState *env)
  81 {
  82     uint32_t ret;
  83
  84     ret = get_NZ_icc(CC_DST);
  85     ret |= get_V_div_icc(CC_SRC2);
  86     return ret;
  87 }
  88
  89 static uint32_t compute_C_div(CPUSPARCState *env)
  90 {
  91     return 0;
  92 }
  93
  94 static inline uint32_t get_C_add_icc(uint32_t dst, uint32_t src1)
  95 {
  96     uint32_t ret = 0;
  97
  98     if (dst < src1) {
  99         ret = PSR_CARRY;
 100     }
 101     return ret;
 102 }
 103
 104 static inline uint32_t get_C_addx_icc(uint32_t dst, uint32_t src1,
 105                                       uint32_t src2)
 106 {
 107     uint32_t ret = 0;
 108
 109     if (((src1 & src2) | (~dst & (src1 | src2))) & (1U << 31)) {
 110         ret = PSR_CARRY;
 111     }
 112     return ret;
 113 }
 114
 115 static inline uint32_t get_V_add_icc(uint32_t dst, uint32_t src1,
 116                                      uint32_t src2)
 117 {
 118     uint32_t ret = 0;
 119
 120     if (((src1 ^ src2 ^ -1) & (src1 ^ dst)) & (1U << 31)) {
 121         ret = PSR_OVF;
 122     }
 123     return ret;
 124 }
 125
 126 #ifdef TARGET_SPARC64
 127 static inline uint32_t get_C_add_xcc(target_ulong dst, target_ulong src1)
 128 {
 129     uint32_t ret = 0;
 130
 131     if (dst < src1) {
 132         ret = PSR_CARRY;
 133     }
 134     return ret;
 135 }
 136
 137 static inline uint32_t get_C_addx_xcc(target_ulong dst, target_ulong src1,
 138                                       target_ulong src2)
 139 {
 140     uint32_t ret = 0;
 141
 142     if (((src1 & src2) | (~dst & (src1 | src2))) & (1ULL << 63)) {
 143         ret = PSR_CARRY;
 144     }
 145     return ret;
 146 }
 147
 148 static inline uint32_t get_V_add_xcc(target_ulong dst, target_ulong src1,
 149                                      target_ulong src2)
 150 {
 151     uint32_t ret = 0;
 152
 153     if (((src1 ^ src2 ^ -1) & (src1 ^ dst)) & (1ULL << 63)) {
 154         ret = PSR_OVF;
 155     }
 156     return ret;
 157 }
 158
 159 static uint32_t compute_all_add_xcc(CPUSPARCState *env)
 160 {
 161     uint32_t ret;
 162
 163     ret = get_NZ_xcc(CC_DST);
 164     ret |= get_C_add_xcc(CC_DST, CC_SRC);
 165     ret |= get_V_add_xcc(CC_DST, CC_SRC, CC_SRC2);
 166     return ret;
 167 }
 168
 169 static uint32_t compute_C_add_xcc(CPUSPARCState *env)
 170 {
 171     return get_C_add_xcc(CC_DST, CC_SRC);
 172 }
 173 #endif
 174
 175 static uint32_t compute_all_add(CPUSPARCState *env)
 176 {
 177     uint32_t ret;
 178
 179     ret = get_NZ_icc(CC_DST);
 180     ret |= get_C_add_icc(CC_DST, CC_SRC);
 181     ret |= get_V_add_icc(CC_DST, CC_SRC, CC_SRC2);
 182     return ret;
 183 }
 184
 185 static uint32_t compute_C_add(CPUSPARCState *env)
 186 {
 187     return get_C_add_icc(CC_DST, CC_SRC);
 188 }
 189
 190 #ifdef TARGET_SPARC64
 191 static uint32_t compute_all_addx_xcc(CPUSPARCState *env)
 192 {
 193     uint32_t ret;
 194
 195     ret = get_NZ_xcc(CC_DST);
 196     ret |= get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
 197     ret |= get_V_add_xcc(CC_DST, CC_SRC, CC_SRC2);
 198     return ret;
 199 }
 200
 201 static uint32_t compute_C_addx_xcc(CPUSPARCState *env)
 202 {
 203     uint32_t ret;
 204
 205     ret = get_C_addx_xcc(CC_DST, CC_SRC, CC_SRC2);
 206     return ret;
 207 }
 208 #endif
 209
 210 static uint32_t compute_all_addx(CPUSPARCState *env)
 211 {
 212     uint32_t ret;
 213
 214     ret = get_NZ_icc(CC_DST);
 215     ret |= get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
 216     ret |= get_V_add_icc(CC_DST, CC_SRC, CC_SRC2);
 217     return ret;
 218 }
 219
 220 static uint32_t compute_C_addx(CPUSPARCState *env)
 221 {
 222     uint32_t ret;
 223
 224     ret = get_C_addx_icc(CC_DST, CC_SRC, CC_SRC2);
 225     return ret;
 226 }
 227
 228 static inline uint32_t get_V_tag_icc(target_ulong src1, target_ulong src2)
 229 {
 230     uint32_t ret = 0;
 231
 232     if ((src1 | src2) & 0x3) {
 233         ret = PSR_OVF;
 234     }
 235     return ret;
 236 }
 237
 238 static uint32_t compute_all_tadd(CPUSPARCState *env)
 239 {
 240     uint32_t ret;
 241
 242     ret = get_NZ_icc(CC_DST);
 243     ret |= get_C_add_icc(CC_DST, CC_SRC);
 244     ret |= get_V_add_icc(CC_DST, CC_SRC, CC_SRC2);
 245     ret |= get_V_tag_icc(CC_SRC, CC_SRC2);
 246     return ret;
 247 }
 248
 249 static uint32_t compute_all_taddtv(CPUSPARCState *env)
 250 {
 251     uint32_t ret;
 252
 253     ret = get_NZ_icc(CC_DST);
 254     ret |= get_C_add_icc(CC_DST, CC_SRC);
 255     return ret;
 256 }
 257
 258 static inline uint32_t get_C_sub_icc(uint32_t src1, uint32_t src2)
 259 {
 260     uint32_t ret = 0;
 261
 262     if (src1 < src2) {
 263         ret = PSR_CARRY;
 264     }
 265     return ret;
 266 }
 267
 268 static inline uint32_t get_C_subx_icc(uint32_t dst, uint32_t src1,
 269                                       uint32_t src2)
 270 {
 271     uint32_t ret = 0;
 272
 273     if (((~src1 & src2) | (dst & (~src1 | src2))) & (1U << 31)) {
 274         ret = PSR_CARRY;
 275     }
 276     return ret;
 277 }
 278
 279 static inline uint32_t get_V_sub_icc(uint32_t dst, uint32_t src1,
 280                                      uint32_t src2)
 281 {
 282     uint32_t ret = 0;
 283
 284     if (((src1 ^ src2) & (src1 ^ dst)) & (1U << 31)) {
 285         ret = PSR_OVF;
 286     }
 287     return ret;
 288 }
 289
 290
 291 #ifdef TARGET_SPARC64
 292 static inline uint32_t get_C_sub_xcc(target_ulong src1, target_ulong src2)
 293 {
 294     uint32_t ret = 0;
 295
 296     if (src1 < src2) {
 297         ret = PSR_CARRY;
 298     }
 299     return ret;
 300 }
 301
 302 static inline uint32_t get_C_subx_xcc(target_ulong dst, target_ulong src1,
 303                                       target_ulong src2)
 304 {
 305     uint32_t ret = 0;
 306
 307     if (((~src1 & src2) | (dst & (~src1 | src2))) & (1ULL << 63)) {
 308         ret = PSR_CARRY;
 309     }
 310     return ret;
 311 }
 312
 313 static inline uint32_t get_V_sub_xcc(target_ulong dst, target_ulong src1,
 314                                      target_ulong src2)
 315 {
 316     uint32_t ret = 0;
 317
 318     if (((src1 ^ src2) & (src1 ^ dst)) & (1ULL << 63)) {
 319         ret = PSR_OVF;
 320     }
 321     return ret;
 322 }
 323
 324 static uint32_t compute_all_sub_xcc(CPUSPARCState *env)
 325 {
 326     uint32_t ret;
 327
 328     ret = get_NZ_xcc(CC_DST);
 329     ret |= get_C_sub_xcc(CC_SRC, CC_SRC2);
 330     ret |= get_V_sub_xcc(CC_DST, CC_SRC, CC_SRC2);
 331     return ret;
 332 }
 333
 334 static uint32_t compute_C_sub_xcc(CPUSPARCState *env)
 335 {
 336     return get_C_sub_xcc(CC_SRC, CC_SRC2);
 337 }
 338 #endif
 339
 340 static uint32_t compute_all_sub(CPUSPARCState *env)
 341 {
 342     uint32_t ret;
 343
 344     ret = get_NZ_icc(CC_DST);
 345     ret |= get_C_sub_icc(CC_SRC, CC_SRC2);
 346     ret |= get_V_sub_icc(CC_DST, CC_SRC, CC_SRC2);
 347     return ret;
 348 }
 349
 350 static uint32_t compute_C_sub(CPUSPARCState *env)
 351 {
 352     return get_C_sub_icc(CC_SRC, CC_SRC2);
 353 }
 354
 355 #ifdef TARGET_SPARC64
 356 static uint32_t compute_all_subx_xcc(CPUSPARCState *env)
 357 {
 358     uint32_t ret;
 359
 360     ret = get_NZ_xcc(CC_DST);
 361     ret |= get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
 362     ret |= get_V_sub_xcc(CC_DST, CC_SRC, CC_SRC2);
 363     return ret;
 364 }
 365
 366 static uint32_t compute_C_subx_xcc(CPUSPARCState *env)
 367 {
 368     uint32_t ret;
 369
 370     ret = get_C_subx_xcc(CC_DST, CC_SRC, CC_SRC2);
 371     return ret;
 372 }
 373 #endif
 374
 375 static uint32_t compute_all_subx(CPUSPARCState *env)
 376 {
 377     uint32_t ret;
 378
 379     ret = get_NZ_icc(CC_DST);
 380     ret |= get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
 381     ret |= get_V_sub_icc(CC_DST, CC_SRC, CC_SRC2);
 382     return ret;
 383 }
 384
 385 static uint32_t compute_C_subx(CPUSPARCState *env)
 386 {
 387     uint32_t ret;
 388
 389     ret = get_C_subx_icc(CC_DST, CC_SRC, CC_SRC2);
 390     return ret;
 391 }
 392
 393 static uint32_t compute_all_tsub(CPUSPARCState *env)
 394 {
 395     uint32_t ret;
 396
 397     ret = get_NZ_icc(CC_DST);
 398     ret |= get_C_sub_icc(CC_SRC, CC_SRC2);
 399     ret |= get_V_sub_icc(CC_DST, CC_SRC, CC_SRC2);
 400     ret |= get_V_tag_icc(CC_SRC, CC_SRC2);
 401     return ret;
 402 }
 403
 404 static uint32_t compute_all_tsubtv(CPUSPARCState *env)
 405 {
 406     uint32_t ret;
 407
 408     ret = get_NZ_icc(CC_DST);
 409     ret |= get_C_sub_icc(CC_SRC, CC_SRC2);
 410     return ret;
 411 }
 412
 413 static uint32_t compute_all_logic(CPUSPARCState *env)
 414 {
 415     return get_NZ_icc(CC_DST);
 416 }
 417
 418 static uint32_t compute_C_logic(CPUSPARCState *env)
 419 {
 420     return 0;
 421 }
 422
 423 #ifdef TARGET_SPARC64
 424 static uint32_t compute_all_logic_xcc(CPUSPARCState *env)
 425 {
 426     return get_NZ_xcc(CC_DST);
 427 }
 428 #endif
 429
 430 typedef struct CCTable {
 431     uint32_t (*compute_all)(CPUSPARCState *env); /* return all the flags */
 432     uint32_t (*compute_c)(CPUSPARCState *env);  /* return the C flag */
 433 } CCTable;
 434
 435 static const CCTable icc_table[CC_OP_NB] = {
 436     /* CC_OP_DYNAMIC should never happen */
 437     [CC_OP_FLAGS] = { compute_all_flags, compute_C_flags },
 438     [CC_OP_DIV] = { compute_all_div, compute_C_div },
 439     [CC_OP_ADD] = { compute_all_add, compute_C_add },
 440     [CC_OP_ADDX] = { compute_all_addx, compute_C_addx },
 441     [CC_OP_TADD] = { compute_all_tadd, compute_C_add },
 442     [CC_OP_TADDTV] = { compute_all_taddtv, compute_C_add },
 443     [CC_OP_SUB] = { compute_all_sub, compute_C_sub },
 444     [CC_OP_SUBX] = { compute_all_subx, compute_C_subx },
 445     [CC_OP_TSUB] = { compute_all_tsub, compute_C_sub },
 446     [CC_OP_TSUBTV] = { compute_all_tsubtv, compute_C_sub },
 447     [CC_OP_LOGIC] = { compute_all_logic, compute_C_logic },
 448 };
 449
 450 #ifdef TARGET_SPARC64
 451 static const CCTable xcc_table[CC_OP_NB] = {
 452     /* CC_OP_DYNAMIC should never happen */
 453     [CC_OP_FLAGS] = { compute_all_flags_xcc, compute_C_flags_xcc },
 454     [CC_OP_DIV] = { compute_all_logic_xcc, compute_C_logic },
 455     [CC_OP_ADD] = { compute_all_add_xcc, compute_C_add_xcc },
 456     [CC_OP_ADDX] = { compute_all_addx_xcc, compute_C_addx_xcc },
 457     [CC_OP_TADD] = { compute_all_add_xcc, compute_C_add_xcc },
 458     [CC_OP_TADDTV] = { compute_all_add_xcc, compute_C_add_xcc },
 459     [CC_OP_SUB] = { compute_all_sub_xcc, compute_C_sub_xcc },
 460     [CC_OP_SUBX] = { compute_all_subx_xcc, compute_C_subx_xcc },
 461     [CC_OP_TSUB] = { compute_all_sub_xcc, compute_C_sub_xcc },
 462     [CC_OP_TSUBTV] = { compute_all_sub_xcc, compute_C_sub_xcc },
 463     [CC_OP_LOGIC] = { compute_all_logic_xcc, compute_C_logic },
 464 };
 465 #endif
 466
 467 void helper_compute_psr(CPUSPARCState *env)
 468 {
 469     uint32_t new_psr;
 470
 471     new_psr = icc_table[CC_OP].compute_all(env);
 472     env->psr = new_psr;
 473 #ifdef TARGET_SPARC64
 474     new_psr = xcc_table[CC_OP].compute_all(env);
 475     env->xcc = new_psr;
 476 #endif
 477     CC_OP = CC_OP_FLAGS;
 478 }
 479
 480 uint32_t helper_compute_C_icc(CPUSPARCState *env)
 481 {
 482     uint32_t ret;
 483
 484     ret = icc_table[CC_OP].compute_c(env) >> PSR_CARRY_SHIFT;
 485     return ret;
 486 }